Influence of Sesbania Rostrata on Soil Properties and Yield of Onion
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1 International Journal of Scientific and Research Publications, Volume 4, Issue 9, September Influence of Sesbania Rostrata on Soil Properties and Yield of Onion Loganathan, P. Department of Bio Science, Vavuniya Campus, University of Jaffna. Abstract- The study was carried out in Government Seed farm Vavuniya from June 2012 to September 2012 by Random Completely Block Design (RCBD) with nine treatments and three replicates to study the role of Sebania rostrata in relation to soil properties and to evaluate the suitability of Sesbania and inorganic fertilizers on the yield of onion. The green manure (Sesbania rostrata and Crotalaria juncea (sunhemp)) were incorporated into the soil before 14 days of planting by manually. Onion bulb( Vethalam variety) was planted fourteen days after incorporation of organic material with spacing of 10 cm x 10 cm in a plot size of 1m x 1m. The treatments T2 T9 plots were fertilized with urea, Sesbania rostrata and sunhemp and it s combinations at the equivalent of 6.21g total N per m 2 (Department Recommendation ). Plants were irrigated once in 4 days as farmer practiced. The soil samples were collected for analysis after harvesting to measure the ph, EC, CEC, organic matter content, No3- N and NH4 N. Total yield per plot were collected. Statistical analysis was carried out using SAS package (version 9.0) and mean separation was done by Dunkan s mean separation. Incorporation of green manure significantly increased soil organic matter content and CEC. Combination of Sesbania and inorganic fertilizer and sunhemp & inorganic fertilizer ensure same yield as inorganic fertilizer along. But sunhemp does not withstand water logging condition and also produce nitrogen lesser than sesbania. Hence incorporation of sesbania as green manure with inorganic fertilizer is good alternative methods to improve soil fertility and obtain good yield. Nitrate leaching to below root zone can be reduced by combination of organic and inorganic N fertilization. This study revealed that the application of inorganic N fertilizer combined with green manure of Sesbania rostrata and Crotalaria juncea is a viable alternative method to reduce nitrate pollution in ground water and obtain more or less same yield as inorganic fertilizer along. Sesbania rostrata can be cultivated in any types of field but Crotalaria juncea is not suitable for water logging field. Index Terms- Sesbania rostrata, soil properties, green manure, inorganic fertilizer N I. INTRODUCTION itrate contamination of ground water has become a serious problem in northern part of Sri Lanka where intensified agriculture is being practiced (Nagarajah et al., 1988). Incorporation of Sesbania rostrata is the one ways to improve soil properties and minimize nitrate leachate in soil. My previous leaching column study showed Nitrate losses were less in green manure(sesbania, Sunhemp & Gliricidia) added soil than inorganic fertilized (urea) soil. The field study could be carried out to confirm the finding to implement the findings in farmers field. Sesbania rostrata is a green manure crop, which has nodules both on the stem and root. A green matter yield of 15 to 20 t/ha equivalent to kg N/ha is obtained within a period of 8 to 10 weeks. Sesbania rostrata is producing nearly double amount of nitrogen per hectare compare to Crotalaria juncea. Therefore incorporation of Sesbania rostrata is important to improve soil properties and reduce nitrate losses and reduce the cost for inorganic fertilizer and cultivation. Hence, the use of Sesbania rostrata is both economically and environmentally friendly. The main objectives of the research were to study the role of Sesbania rostrata in relation to soil properties and to evaluate the suitability of green manures and inorganic fertilizers on the yield of onion. II. MATERIALS AND METHODS The study was carried out in Government Seed Farm production unit Vavuniya from June 2012 to September 2012 by Random Completely Block Design (RCBD) with nine treatments and three replicates. The green manure (Sesbania rostrata and Crotalaria juncea) were incorporated into the soil before 14 days of planting by manually (Figure 1.0). Onion bulb( Vethalam variety) was planted fourteen days after incorporation of green manure with spacing of 10 cm x 10 cm in a plot size of 1m x 1m. The treatments T2 T9 plots were fertilized with urea, Sesbania rostrata and Crotalaria juncea and it s combinations at the equivalent of 6.21g total N per m 2 ((Recommendation for onion crop by the Department of Agriculture, Sri Lanka). Plants were irrigated once in 4 days as farmer practiced. The treatments of field experiment were T 1 No N fertilizer application, T2 Urea 50%N ( 31.5 kg N/ha) T 3 Urea 100%N (62 kgn/ha) T4 Urea 150% N (93.5 kg/n) T5 Urea 50%N + Ssbania rostrata 50%N (62 kgn/ha) T6 Urea 50%N + Crotalaria juncea 50%N (62 kgn/ha) T7 Urea 50%N + Sesbania rostrata 25 %N + Crotalaria juncea 25%N(62 kgn/ha) T8 Urea 25%N + Sesbania rostrata 75%N(62 kgn/ha) and T9 Urea25%N + Crotalaria juncea 75 % N (62 kgn/ha). After 60 days onion was harvested in the net rows and measured total bulb yield. The soil samples were collected for analysis after harvesting to measure the ph, EC, CEC, organic matter content, No3- N and NH4 N. NO 3 -N in soil was determined by sodium salicylate method, NH4 N was determined by Indophenols blue method and Organic matter content by the dichromate digestion Walkley & Black method,
2 International Journal of Scientific and Research Publications, Volume 4, Issue 9, September (Dharmakeerthi et al., 2007). CEC of soil was determined by ionic replacement with 1M neutral ammonium acetate, followed by distillation and titration (Chapman, 1965). ph and EC were determined by ph meter and electric conductivity meter respectively. Statistical analysis was carried out using SAS package (version 9.0) and mean separation was done by Dunkan s mean separation. III. RESULT AND DISCUSSION General characteristics of soil The soil of the experimental site was classified as Reddish Brown Earth. Texture of the soil was sandy clay loam with low nitrogen and organic matter content (Table 1.0). Properties of soil after incoporation of green manure ph of soil varied from 7.3 to 7.9 and soil showed slightly alkaline nature and ph of green manure added soil was lesser than inorganic fertilizer alone ( Table 2.0). Incorporation of green manure reduced soil ph (Sangakkara, et. al 2006). Organic matter content of soil varied from 0.83 to and incorporation of Sesbania rostrata and Crotalaria juncea significantly (P <0.001) increased soil organic mater content (Table 3.2). Soil organic matter is important to increase nutrient retain capacity and reduce leaching loss. Organic matter permits better aeration, enhances the absorption and release of nutrients, and makes the soil less susceptible to leaching and erosion (Sekhon and Meelu, 1994). CEC of soil varied from 24.2 to 32.8 and incorporation of Sesbania rostrata and Crotalaria juncea significantly ( P < ) increased soil CEC. CEC of soil also important soil properties to increase nutrient capacity of soil and reduce nutrient loss from soil. Inclusion of organic matter is of primary importance in maintaining soil fertility, productivity and sustainability (Dick & Gregorich 2004). Incorporation of Sesbania rostrata and Crotalaria juncea with in organic fertilizer significantly increased NH4- N and No3 - N retention ability in top soil after onion cultivation than inorganic fertilizer alone. Hence it reduce the nutrient losses by leaching. Yield of Onion under incorporation of Sesbania rostrata and Crotalaria juncea Red onion yields of the treatments ranged from 24.7 to 27.9 t/ha (Figure 2.0) and those were higher than the average yield obtained by the farmers of the study area. The control showed a significantly (P<0.001) lower yield compared to the treatments. Yields of inorganic and combination of green manure and inorganic fertilized plots did not show any significant differences (Table 3.0). These results showed that the combined use of green manure and inorganic fertilizer is an effective soil N management strategy that can ensure high yields. Amujoyegbe et. al, (2007) reported that the use of combination of organic and inorganic fertilizer could increase crop yield and reduce the high cost of fertilizer to subsistence farmers in Nigeria. Combination of Sesbania and inorganic fertilizer and sunhemp & inorganic fertilizer ensured same yield as inorganic fertilizer along. But sunhemp does not withstand water logging condition and also produce nitrogen lesser than sesbania. Hence incorporation of sesbania as green manure with inorganic fertilizer is good alternative methods to improve soil fertility and obtain good yield. Use of green manure has the potential to increase maize yield in Limpopo province, South Africa (Jude 2011) Nitrate Nitrogen in below root zone under Sesbania rostrata and Crotalaria juncea incorporation Nitrate nitrogen content at cm soil layer after harvesting of onion was significantly (P<0.0001)high in recommended inorganic N added plots and combination of inorganic N and green manure added plots than control(no N fertilizer application). Hence application of fertilizer increased nitrate nitrogen to the bottom layer (below root zone). But Nitrate nitrogen in below root zone was high in inorganic fertilizer application along than combination of inorganic N and green manure added plots. Highest amount of nitrate nitrogen was observed in T4 where highest amount of inorganic N (1 ½ Urea) added plot (Table 4.0 ). In thavashikulam area farmers apply fertilizer higher than recommended level of fertilizer. Hence excess amount of fertilizer cause ground water pollution(loganathan 2011). Nitrate leaching from agricultural field is function of fertilizer rate (Bawatharani et. al, 2004). This study showed that nitrate leaching to below root zone can be reduced by combination of organic and inorganic N fertilization. IV. CONCLUSION This study revealed that the application of inorganic N fertilizer combined with green manure of Sesbania rostrata and Crotalaria juncea is a viable alternative method to reduce nitrate pollution in ground water and obtain more or less same yield as inorganic fertilizer along. Sesbania rostrata can be cultivated in any types of field but Crotalaria juncea is not suitable for water logging field.. ACKNOWLEDGMENT Authors wish to acknowledge the financial assistance given by Vavuniya Campus through Research Grant REFERENCES [1] Amujoyegbe, B.J., J.T. Opabode, and A. Olayinka Effect of organic and inorganic fertilizer on yield and chlorophyll content of maize and sorghum. African Journal of Biotechnology Vol 6 (16) [2] Bavatharani,T., M.I.M.Mowjood, N.D.K. Dayawansa, and D.Kumaragamage Nitrate leaching as function of fertilizer and Irrigation practices in Sandy Regosols. Tropical agriculture research Vol 16 : [3] Chapman, H.D Cation exchange capacity. In: Method of soil analysis. Agronomy 9, American society of Agronomy. (Eds. C.A Black et al), pp Inc, Madison, Wisconso, USA [4] Dharmakeerthi, R.S., S.P.Indrani, and D.Kumaragamaghe Manual of soil sampling and analysis. Soil science society of Sri Lanka. P [5] Dick,W.A, and E.G.Gregorich Developing and maintaining soil organic matter levels. In managing soil quality, challenges in modern agriculture. pp CABI, Wallingfort,UK. [6] Jude, J. and O.Odhiambo. Potential use of green manure cover crops in small holeder maize production system in Limpopo province,south Africa. African Journal of Agriculture Research Vol 6 (1), pp th January [7] Loganathan,P Causes for nitrate pollution in ground water; A case study from Vavuniya District Sri Lanka. The 10th International conference
3 International Journal of Scientific and Research Publications, Volume 4, Issue 9, September of the East and South East Asia Federation of Soil Science Societies. October , Colombo, Sri Lanka. P [8] Taras, M.J. (1958) Nitrogen. In: Chemical analysis Vol VIII. Calorimetric determination of non-metels. Ed.D.F.Bolts. Inter Science Publishers Inc, New York. [9] Technoguide Department of Agriculture, Peradeniya. P [10] Sangakkara, U.R., G.Pietsch, M. Gollner, and B.Freyer Selected Soil Parameters, Growth and Yields of Mungbean Grown in a Minor Season in the Humid Tropics. Austrian Journal of Agricultural Research 57: [11] Sekhon, G.S. and Meelu, O.P Organicmatter management in relation to crop production in stressed rainfed systems. In: Stressedecosystems and sustainable agriculture. (Eds. S.M. Virmani, J. C. Katyal, H. Eswaran, and I. P.Abrol). New Delhi: Oxford University Press and IBH Publishing. AUTHORS First Author Ms.P.Loganathan, Senior Lecturer (B.Sc in Agriculture, Sri Lanka and MSc in MNRSA, Norway). Vauniya Campus of the University of Jaffna. puvanalogan@gmail.com, plogan@mail.vau.jfn.ac.lk Sesbania green manure is added to field Incorporation of Sesbania green manure Onion bulb is in field Onion crop is in field 3 WAP Figure 01 Cultivation of onion under green manure application
4 International Journal of Scientific and Research Publications, Volume 4, Issue 9, September Table 1.0 General characteristic of soil Soil property ph 7.2 EC (ms) 1.1 Content bulk density( gm -3 ) 1.55 CEC 24.3 Organic matter % 0.88 Total N% 0.11 Soil texture Sand% Clay% Slit% 8.0 sandy clay loam Table 2.0 Chemical properties of soil after harvesting of onion Treatments ph Organic matter % T 1 No N fertilizer application 7.7abc 0.83d CEC C mol 24.2d NO3- -N (ppm) 0.90c 325d NH4+ - N (ppb) T2 Urea 50%N 7.8a 1.03d 24.8cd 1.11bc 442dc T 3 Urea 100 %N 7.8ab 1.17bcd 25.8c 1.09bc 464dc T4 Urea 150%N 7.9a 1.13cd 25.6c 1.12bc 564bc T5 Urea 50%N+ Sesbania rostrata 50%N 7.5bcd 1.53abc 32a 1.28ab 748ab T6 Urea 50%N and Crotalaria juncea 50%N 7.6abcd 1.67a 32.8a 1.33ab 739ab T7 Urea50%N + Sesbania rostrata 25%N+ Crotalaria juncea 32.3a 25%N 7.3d 1.70a 1.43a 767a T8 urea 25%N + Sesbania 30.4b rostrata 75%N 7.5bcd 1.57ab 1.37ab 671ab T9 Urea 25%N+ Crotalaria 31.5ab juncea 75%N 7.4cd 1.63a 1.31ab 683ab Note : Means with the same letters are not significantly different
5 International Journal of Scientific and Research Publications, Volume 4, Issue 9, September Figure 2.0 Onion Yield under green manure application Table 3.0 Onion yield under different treatments Treatments T 1 No N fertilizer application Note : Means with the same letters are not significantly different. Yield (t/ha) 20.3c T2 Urea 50%N 25.0b T 3 Urea 100 %N 25.1b T4 Urea 150%N 25.2ab T5 Urea 50%N+ Sesbania rostrata 50%N 26.8ab T6 Urea 50%N and Crotalaria juncea 50%N 27.9a T7 Urea50%N + Sesbania rostrata 25%N+ Crotalaria juncea 25%N 24.7b T8 urea 25%N + Sesbania rostrata 75%N 25.3ab T9 Urea 25%N+ Crotalaria juncea 75%N 26.5ab
6 International Journal of Scientific and Research Publications, Volume 4, Issue 9, September Table 4.0 Nitrate nitrogen in below root zone NO3- -N Treatments (ppm) T 1 No N fertilizer application 0.82 c T2 Urea 50%N 1.29 ab T 3 Urea 100 %N 1.34 ab T4 Urea 150%N 1.43 a T5 Urea 50%N+ Sesbania rostrata 50%N 1.26 b T6 Urea 50%N and Crotalaria juncea 50%N 1.26 b T7 Urea50%N + Sesbania rostrata 25%N+ Crotalaria juncea 25%N 1.22 b T8 urea 25%N + Sesbania rostrata 75%N 1.17 b T9 Urea 25%N+ Crotalaria juncea 75%N 1.29 ab Note : Means with the same letters are not significantly different.
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